Lens length

Hi all,
I’ve been trying to set the camera in order to render my model, except I am unable to change the lens length of the camera? Lens length is grayed out and it wont let me click it or change it from 50.
Is there something in my settings that i need to change to fix this or something like that?
Screenshot 2024-05-17 115344
Thanks

Is your viewport set to Perspective projection?

oh thank you! that was the issue